public class Example2_2 {
 public static void main (String args[]) {
  byte b = 22;
  int n = 129;
  float f = 123456.6789f;
  double d = 123456789.123456789;
  System.out.println("b= "+b);
  System.out.println("n= "+n);
  System.out.println("f= "+f);
  System.out.println("d= "+d);
  b=(byte)n; //导致精度的损失
  f=(float)d; //导致精度的损失
  System.out.println("b= "+b);
  System.out.println("f= "+f);
 }
}

